Ten power microscope objective

ABSTRACT

A three component microscope objective having a numerical aperture of substantially 0.25 and a magnification of substantially 10X is provided by a three element system. The microscope objective provides correction for the usual chromatic image aberrations as well as spherical aberration, coma, and astigmatism while having a substantially flat image field.

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( vqu 'r United S Shoemaker Apr. 8, 1975 i {5 TEN POWER MICROSCOPE OBJECTIVE 3.552.830 l/l97l Shoemaker 350/225 X [75] Inventor: Arthur H. Shoemaker, East Aurora.

NY. Primary E.\'uminer.lohn K. Corbin Almrney. Agenl. 0r Firm-Alan H. Spencer; William [73} Asblgnee' gx ggf gg figl C. Nealon; Howard R. Berkenstock, Jr.

[22] Filed: July 9, 1973 [21] Appl. No.: 377.364 [57] ABSTRACT A three component microscope objective having a nu- [52] Us. Cl 0/225 0/175 ML merical aperture of substantially 0.25 and a magnifica- 511 lm. cl.11..:IIIIIIIII oOEb 9/i2-o02b il/ozsubsamlally is Pmvided by three [58] Field of Search 350M ML 177 225 229 ment system. The microscope objective provides correction for the usual chromatic image aberrations as 6] References Cited well as spherical aberration, coma, and astigmatism while having a substantially flat image field.

UNITED STATES PATENTS 2.713.808 7/1955 Klein 350/l75 ML UX- 2 Claims, 1 Drawing Figure 111 R6 R5 l l TEN POWER MICROSCOPE OBJECTIVE THE DRAWING The drawing is an optical diagram of a microscope objective according to the present invention.

THE INVENTION This invention relates to improvements in a microscope objective, and in particular to a microscope objective with a numerical aperture of substantially 0.25 and a magnification of substantially 10X. It is the object of this invention to provide such a microscope objective which is well corrected for the usual chromatic image aberrations as well as spherical aberration, coma. and astigmatism. while having a substantially flat image field when used with a telescope objective as described in US. Pat. No. 3,355,234 and a typical 10X eyepiece.

FIG. 1 is an optical diagram of the preferred form of the present invention wherein the numeral X designates the objective in general, and numerals I. II, and Ill designate the three optically aligned components of said objective. The foremost component, component I, is a concavo-convex positive lens followed by a double It will be apparent that the foregoing is variable depending on the value of F. Other forms are thus possible and changes may be made in the values of the constructional data based on the relationships with the above charts, without departing from the spirit of this invention.

What is claimed is:

i 1. A three component microscope objective comprising a concavo-convex positive lens as the first element, a double convex positive lens as the second component and a double convex positive doublet as the third component, wherein the parameters of radii (R), lens thicknesses (T), axial spaces along lens elements and objective plane (S), refractive indices (ND), and abbe numbers (y), are determined by the following relationship Refractive Abbe convex positive lens, component ll. Rearmost 1s a dou- 45 Radius Thickness Space Index Number ble convex positive doublet, component III. R T 5 ND y The lens parameters are as follows: The successive s 3384F radii are designated Rl-R7, where a minus sign indi- R 4275F cates radii on centers of curvature lying on the object I 1=- 8 |=L 8833 vr=50.47 side of their vertices. The axial thicknesses of success ll-T5555 552149]: sive lenses are designated Tl-T4. The axial spaces R 2.7523F Refractive Abbe Radius Thickness Space Index Number R T 5 ND y s,=.33s4F R,= .4275F l T\=.2738F ND,=l.78833 y =5().47

S =.2l49F R3= 2.7523F II T2=. l643F ND- ,=l .7883 y. y=50l47 R4= 2.007lF S1.=.5911F R 2.9644F T; =.l095F ND,,=I.78446 y ZSJS III R,: 07934F T4=. l9l6F ND =l .5 l673 -y =64.ll

wherein scalar values are given in millimeters. 

1. A three component microscope objective comprising a concavoconvex positive lens as the first element, a double convex positive lens as the second component and a double convex positive doublet as the third component, wherein the parameters of radii (R), lens thicknesses (T), axial spaces along lens elements and objective plane (S), refractive indices (ND), and abbe numbers (.gamma.), are determined by the following relationship
 2. The microscope objective of claim 1 wherein the parameters of radii (R), lens thicknesses (T), axial spaces along lens elements and object plane (S), refractive indices (ND), and Abbe Numbers (.gamma.), being determined by the following relationship 